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| Titel |
Impacts of fire emissions and transport pathways on the interannual variation of CO in the tropical upper troposphere |
| VerfasserIn |
L. Huang, R. Fu, J. H. Jiang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-25), S.4087-4099 |
| Datensatznummer |
250118636
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| Publikation (Nr.) |
 copernicus.org/acp-14-4087-2014.pdf |
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| Zusammenfassung |
| This study investigates the impacts of fire emission, convection, various
climate conditions and transport pathways on the interannual variation of
carbon monoxide (CO) in the tropical upper troposphere (UT), by evaluating
the field correlation between these fields using multi-satellite
observations and principle component analysis, and the transport pathway
auto-identification method developed in our previous study. The rotated
empirical orthogonal function (REOF) and singular value decomposition (SVD)
methods are used to identify the dominant modes of CO interannual variation
in the tropical UT and to study the coupled relationship between UT CO and
its governing factors. Both REOF and SVD results confirm that Indonesia is
the most significant land region that affects the interannual variation of
CO in the tropical UT, and El Niño–Southern Oscillation (ENSO) is the
dominant climate condition that affects the relationships between surface CO
emission, convection and UT CO. In addition, our results also show that the
impact of El Niño on the anomalous CO pattern in the tropical UT varies
strongly, primarily due to different anomalous emission and convection
patterns associated with different El Niño events. In contrast, the
anomalous CO pattern in the tropical UT during La Niña period appears to
be less variable among different events. Transport pathway analysis suggests
that the average CO transported by the "local convection" pathway (ΔCOlocal)
accounts for the differences of UT CO between different ENSO
phases over the tropical continents during biomass burning season. ΔCOlocal is generally higher over Indonesia–Australia and lower over
South America during El Niño years than during La Niña years. The
other pathway ("advection within the lower troposphere followed by
convective vertical transport") occurs more frequently over the
west-central Pacific during El Niño years than during La Niña years,
which may account for the UT CO differences over this region between
different ENSO phases. |
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